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Aircon not engaging.... and weird fuses

OK guys i need some ideas.... my AC wasn't working, light came on but the compressor clutch wasn't engaging, no biggy i thought so ordered a new one, spent two hours following my own how-to and try it out feeling all smug and the bastard still doesn't engage?! All the fuses appear fine, the AC light comes on but the clutch won't engage... any ideas?

Secondly... are there different versions of the fuse box? Mine is numbered the same as the owners manual but i have fuses in places there should be nothing according to the manual and no fuse where there should be things... but everything in the car works (well except the AC). Should i grab some fuses to put in the spots where there 'should' be things even if those things work?

My understanding is if there’s no gas in the system the compressor won’t engage, also if the tx valve has failed and it’s over pressure the clutch won’t engage. If the light comes on i think that means it has power but you never know with these, maybe throw a multimeter on it to see if it’s getting power?

So auto elec isn't my specialty... i can build/rebuild anything on a car but electrics lose me lol I tested resistance over the new coil and it's the same as the old coil so that confirms i didn't need to replace it! Testing the plug to the coil i can't seem to get any voltage but if i remove the AC relay and manually short it out the coil will click on and off so everything after the relay is working, and the fuses are fine so i guess dodgy relay?

Took it to aircon place today... they did a re-oil and re-gas, said it didn't take much gas and they couldn't find any leaks with the dye (but still slugged me the full $165!) so they weren't sure why it might have triggered the low pressure switch but it all works now?! So i guess it was worth it? LOL They did say it was the cleanest Barina they'd ever worked on though so that was nice haha

They don't know, said take it to an auto elec. Mucking around with it today, put a new relay in it, no difference. If i short out the power for the clutch it does engage but doesn't seem to engage strongly so maybe a bad earth somewhere? Where do you draw the line dropping it off at a sparky to take guesses at while charging you $100/hr on a $1000 car?